XSL problem

I have the following XML that I need converted:

<A1> Text A </A1>
<B2> Text B </B2>
       .
       .
       .

<An> Text A </An>
<Bn> Text B </Bn>

I need the above linear structure converted into the folowing:

<X1>
  <A1> Text A1 </A1>
  <B2> Text B2 </B2>
</X1>
  .
  .
  .
<Xn>
  <An> Text An </An>
  <Bn> Text Bn </Bn>
</Xn>  

I've played w/ it for about 2 days, but being a novice, this has me stumped!
Anyone know how to solve this one?

--shawn


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